Solar powered Dragon Fly

Discussion in 'The Projects Forum' started by garybuska, Sep 30, 2014.

  1. garybuska

    Thread Starter New Member

    Aug 12, 2014
    23
    0
    I recently purchased a multi colored dragon fly for my flower bed
    It somehow got water in it and destroyed the chip that was in it.
    The circuit consisted of a Four pin chip a diode and a small capacitor and of course a LED that has multi colors
    This LED has only two legs, and one 1.2 volt rechargeable battery.
    I know that most led,s need close to 3 volts in order to light but this one seems to need more current. I tried to put this led in a similar circuit using the same kind of chip the 1.2 volt battery will not make it change colors. The circuit did not have the diode and capacitor.
    I figure the diode is a blocking diode and the capacitor is being used to hold a charge
    Does any one have a circuit diagram it is similar to the circuit that uses a Y808 chip and similar to the one that was posted here using a different chip.
    I also know that a data sheet can not be found for these chips and they seem to come from JAPAN
    I have seen three different chips that all look alike. The biggest problem I have is which pin is pin 1
    I am trying to recreate the circuit if possible.
     
  2. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
    4,769
    969
    Google...joule thief for powering an LED with a source below its Vf.
    Also the 2 lead RGB LEDs have a small micro inside of the LED itself that dictates how it changes colors and you cannot change that.
     
  3. wayneh

    Expert

    Sep 9, 2010
    12,107
    3,038
    No inductor? There's usually an inductor as part of the joule-thief circuit. They usually look like a green resistor - a small cylinder with colored bands on it. The 4-pin IC handles the on-off function and runs the oscillator.
     
  4. garybuska

    Thread Starter New Member

    Aug 12, 2014
    23
    0
    Thanks for the reply I actually made a joule thief that works great. But I was hoping to use one of the other circuits and modifying it but with out knowing which pin is pin one this makes it hard as I have no way of knowing if the chip is turned the same way in a different circuit, and do not feel comfortable using the wording on the chip as a means of alignment. Kid of like shooting in the dark
    I am aware of the chip in the LED if i use two 1.5 volt batteries the light will change colors but in the circuit I have it stays red and does not change which tells me something is missing. I am thinking the capacitor is the difference here
     
  5. garybuska

    Thread Starter New Member

    Aug 12, 2014
    23
    0
    You are 100% correct I forgot about that my mistake
     
  6. MrChips

    Moderator

    Oct 2, 2009
    12,440
    3,361
    Post a clear well focused photograph.
     
  7. ronv

    AAC Fanatic!

    Nov 12, 2008
    3,287
    1,253
    Sometimes without the capacitor the circuit keeps getting reset and starting over on the same color. You could try adding the cap across the led.
     
  8. garybuska

    Thread Starter New Member

    Aug 12, 2014
    23
    0
    I wish I could the rain completely destroyed the chip all of the legs had rusted off flush to the board
    But there is a post here that has the circuit I am trying to alter but not sure where it is at.
     
  9. garybuska

    Thread Starter New Member

    Aug 12, 2014
    23
    0
    What value do you suggest I use. about a .01Uf or something smaller
     
  10. ronv

    AAC Fanatic!

    Nov 12, 2008
    3,287
    1,253
    Hard to say without seeing your circuit, but try 10Ufd.
     
  11. garybuska

    Thread Starter New Member

    Aug 12, 2014
    23
    0
    Thanks every one for the replies I give the 10uf cap a try and see what happens. But I still wish I could tell which pin is pin 1. By not knowing there are two ways you could wire this I am not sure what might happen to the chip if I chose pin 4 for pin 1. Since +vcc goes on one end and negative on the other end that makes it easy to get it wrong. It is like a transistor usually the middle leg is the base but that is not always the case and if you do not get it right you can destroy the transistor in some cases. That is what bothers me the most I would hate to get it wrong and destroy a good chip.
    the only thin I have to go on is the writing on the chip hoping that if I turn the chip the same way that the other one is turned it is correct. But that is like playing Russian roulette.
     
  12. garybuska

    Thread Starter New Member

    Aug 12, 2014
    23
    0
  13. ErnieM

    AAC Fanatic!

    Apr 24, 2011
    7,387
    1,605
    Nah, Simon sez don't do that. You want a circuit that will boost the 1.5V from the battery to whatever (3V or so) the LED needs. That will take a ANA618, which is one of the 4-lead devices that can do this (and is available in low & single quantities off EBay).

    I worked this out 3 years back when I first saw those elegant devices, even bought a bunch last year in an "opps got distracted" never to happen attempt to try this myself. I have a thread here that once contained the schematic but seems the link went stale and I've since replaced my PC. It's simple enough, somewhere I have the spec sheet of those devices now with the suggested schematic.
     
  14. wayneh

    Expert

    Sep 9, 2010
    12,107
    3,038
    This is similar. Showed up in several of my solar lights.
     
  15. ErnieM

    AAC Fanatic!

    Apr 24, 2011
    7,387
    1,605
    Do note that device required a CDS photo resistor to detect night. The most recent devices just sense the solar cell voltage to do the same function (and save another tricky to mount part).
     
  16. ronv

    AAC Fanatic!

    Nov 12, 2008
    3,287
    1,253
    The one at the bottom.

    [​IMG]
     
  17. garybuska

    Thread Starter New Member

    Aug 12, 2014
    23
    0
    Now that is what I call service
    I ran across the same circuits earlier But the one that shows the pin outs takes the cake.
    Thanks a lot everyone maybe now I can fix this
     
  18. ErnieM

    AAC Fanatic!

    Apr 24, 2011
    7,387
    1,605
Loading...